A Novel Route to Geminal Dibromocyclobutanes: Syntheses of 2-Substituted Cyclobutanone Acetals and Their Reaction with Boron Tribromide
作者:Tore Nordvik、Udo H. Brinker
DOI:10.1021/jo035295o
日期:2003.11.1
Nine 2-substituted cyclobutanone acetals, in addition to the parent cyclobutanone acetal, were synthesized from their corresponding cyclobutanones and subsequently treated with boron tribromide. The substituents were either alkyl chains or a phenyl and a benzyl group, respectively. The major compounds obtained in these reactions were, in most cases, the geminal dibromocyclobutanes which were obtained
Cyclobutylidenes from geminal dihalogenocyclobutanes
作者:Udo H. Brinker、Gilbert Schenker
DOI:10.1039/c39820000679
日期:——
Cyclobutylidene, or a related carbenoid, can be generated by reaction of geminal dibromocyclobutane with methyl-lithium at temperatures as low as –78 °C to yield methylanecyclopropane and cyclobutene nearly quantitatively.
Discovery of highly potent human glutaminyl cyclase (QC) inhibitors as anti-Alzheimer's agents by the combination of pharmacophore-based and structure-based design
作者:Nguyen Van Manh、Van-Hai Hoang、Van T.H. Ngo、Jihyae Ann、Tae-ho Jang、Jung-Hye Ha、Jae Young Song、Hee-Jin Ha、Hee Kim、Young-Ho Kim、Jiyoun Lee、Jeewoo Lee
DOI:10.1016/j.ejmech.2021.113819
日期:2021.12
tested compounds, the cyclopentylmethyl derivative (214) exhibited the most potent in vitro activity (IC50 = 0.1 nM), while benzimidazole (227) showed the most promising in vivo efficacy, selectivity and druggable profile. 227 significantly reduced the concentration of pyroform Aβ and total Aβ in the brain of an AD animal model and improved the alternation behavior of mice during Y-maze tests. The crystal
The synthesis, structure, conformation, and dynamics of a new rotane family consisting of four-membered rings are described. All syntheses are based on bicyclobutylidene (9): [2+1] cycloaddition of cyclobutylidene yields [3.4]rotane (5) (9−5), [2+2] cycloaddition of trimethyleneketene followed by spiroalkylation of the resulting trispiroketone 10 yields [4.4]rotane (6) (9−10−13−14−6), homologization